class data
{
    public String a=new String();
    public String b=new String();
}    public class Main
{    
    public static void main(String[] args)
    {
        data user[]=new data[200];
        user[0].a="abc";
        JOptionPane.showMessageDialog(null,user[0].a);
    }
    
}

引言: data user[]=new data[200];